|Year|Title|Role|Network|Notes|
|---|---|---|---|---|
|2000|Youth Y2K 青春@Y2K|Cheng Shasha|||
|2001|The Monkey King: Quest for the Sutra 齊天大聖孫悟空|Purple Orchid|TVB||
|2001|藍寶石的夜空|Shek Po-yi|TVB|Eason Chan's music video|
|2002|一Twins零一夜|Ah Sa|TVB|Music video|
|2003|Triumph in the Skies 衝上雲霄|Charlene|TVB|Cameo|
|2003|All About Boy'z 一起喝采|Langlang Princess|now.com.hk|Appearance in episode 2|
|2003|2半3更之困車立|Ah Sa|now.com.hk||
|2003|愛在陽光下|AIDS patient||Music video produced to support the global anti-AIDS campaign|
|2004|Kung Fu Soccer 功夫足球||TVB|Guest star|
|2004|Sunshine Heartbeat 赤沙印記@四葉草.2|Ah Sa|TVB|Guest star|
|2004|家有寶貝|Ah Sa||Guest star|
|2007|Colours of Love 森之愛情|Wai-fong / Ching-lan|TVB||
|2007|Life Off Stage||||
|2010|Calling for Love! 呼叫大明星|Chen Dexin|CTS||
|2011|The Legend of Swordman 劍俠情緣|Tang Xiaowan / Ning Xin|||
|2012|Happy Marshal 歡樂元帥|Little Dragon Girl (Xiao Long Nu)|||

Question: what is the number of networks listed in the table?
Answer: 3